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From "Matthew Mchale" <mmch...@nuhorizons.com>
Subject Could not connect to SMTP host: localhost, port: 25
Date Fri, 26 Jan 2007 21:33:59 GMT
A team, of which I am a member, is in the process of moving several
applications from Websphere App server to Tomcat. I've had an email function
in my application for a long while with no trouble. Now, I have an
intermittent problem occurring when I try to use JavaMail to send email.  It
works sometimes and not others. The exception says something about
connecting to the localhost, but I set mail.smtp.host to a remote host.

It appears to be related to system resources in some way because the problem
tends to arise after the server has been running for a few hours. I
increased the heap size and the MaxPermSize, but there doesn't really seem
to be a shortage in memory according to Lambda Probe. It still happens on
and off. There are also a few other web apps running on this Tomcat instance
as well.  

Any ideas on how to make this more stable would be appreciated.  Are there
Tomcat specific things I need to do for JavaMail?

Thanks so much for any help,
Matt


Below are the stack trace and a snippet of the JavaMail code.

Properties props = System.getProperties(); 
props.put("mail.smtp.host", this.smtpServer); 
Session session = Session.getDefaultInstance(props, null);
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(this.from));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(this.to));
msg.setSubject(this.subject);
msg.setText(this.body);
msg.setSentDate(new Date());
Transport.send(msg);


ERROR 2007-01-26 11:14:37,913 (ComplicatedEmail.java:send:125) -
javax.mail.MessagingException: Could not connect to SMTP host: localhost,
port: 25; 
nested exception is: 
java.net.ConnectException: Connection refused: connect 
javax.mail.MessagingException: Could not connect to SMTP host: localhost,
port: 25; 
nested exception is: 
java.net.ConnectException: Connection refused: connect 
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282) 
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370) 
at javax.mail.Service.connect(Service.java:275) 
at javax.mail.Service.connect(Service.java:156) 
at javax.mail.Service.connect(Service.java:105) 
at javax.mail.Transport.send0(Transport.java:168) 
at javax.mail.Transport.send(Transport.java:98) 
at
com.nuhorizons.rosettanet.www.ComplicatedEmail.send(ComplicatedEmail.java:11
2) 
at
com.nuhorizons.rosettanet.util.AlertEmailUtil.sendEmail(AlertEmailUtil.java:
265) 
at
com.nuhorizons.rosettanet.util.AlertEmailUtil.sendDesignEmail(AlertEmailUtil
.java:242) 
at
com.nuhorizons.rosettanet.util.AlertEmailUtil.send5C2SentSuccessfully(AlertE
mailUtil.java:148) 
at
com.nuhorizons.rosettanet.controller.transmit.remote.RemoteRequestRegistrati
onTransmitter.sendSuccessAlert(RemoteRequestRegistrationTransmitter.java:150
) 
at
com.nuhorizons.rosettanet.controller.transmit.remote.RemoteMessageTransmitte
r.doPost(RemoteMessageTransmitter.java:107) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:252) 
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:173) 
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:213) 
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:178) 
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126
) 
at
org.jstripe.tomcat.probe.Tomcat55AgentValve.invoke(Tomcat55AgentValve.java:2
0) 
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105
) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)

at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:107) 
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) 
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) 
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processC
onnection(Http11BaseProtocol.java:664) 
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav
a:527) 
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo
rkerThread.java:80) 
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:684) 
at java.lang.Thread.run(Thread.java:595) 
Caused by: java.net.ConnectException: Connection refused: connect 
at java.net.PlainSocketImpl.socketConnect(Native Method) 
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333) 
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195) 
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182) 
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) 
at java.net.Socket.connect(Socket.java:507) 
at java.net.Socket.connect(Socket.java:457) 
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:232) 
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189) 
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1250) 
... 30 more 




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